Worst: Wow! Who took Katy Perry back to her strict religious upbringing?

Photo: Jason Kempin, Getty Images For PCA

Worst: Wow! Who took Katy Perry back to her strict religious...

Worst: Wow! Who took Katy Perry back to her strict religious... Photo-4008534.54915 - SFGate

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Worst: Fringe like this belongs on a Tiffany lampshade, not on actress Erinn Hayes.

Photo: Jason Kempin, Getty Images For PCA

Worst: Fringe like this belongs on a Tiffany lampshade, not on...

Worst: Fringe like this belongs on a Tiffany lampshade, not on... Photo-4008525.54915 - SFGate

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Best: On anyone else this might look like some sort of medieval parody, with the leather and the giant, blocky pleats, but Jennifer Aniston almost never makes a fashion misstep and this is devastatingly youthful for someone who will soon be 44.

Photo: Michael Buckner, Getty Images For PCA

Best: On anyone else this might look like some sort of medieval...

Best: On anyone else this might look like some sort of medieval... Photo-4008528.54915 - SFGate

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Worst: Dancer Karina Smirnoff appears to be ready for bed in her boudoir in some 1940s-era film. Unfortunately, it's 2013 and she's out in public.

Worst: If you don't know who Tracy Spiridakos is, you haven't been watching NBC's hit series "Revolution." Which brings to mind a hard and fast rule about worst-dressed lists: If you look better in your TV role as a smudged and bedraggled revolutionary than on the red carpet, you belong on the list.

Best: "Grey's Anatomy" star Ellen Pompeo dons a flattering, full-length dress that suits her wispy figure perfectly. The sleeves are a nice touch and there's a demure opening up the left leg (not seen here) that gives extra length to her 5-foot-7 stature.

On the fence: We've come to expect "Glee" chanteuse Lea Michele wearing tight and/or revealing clothes on the red carpet, and that's fine -- she's petite, has a good body and wears well-tailored frocks. This dress is no exception, and there are few who could carry this color so well. But what's with the hair?

Worst: On its face, there's nothing wrong with Taylor Swift's gown. She's 23 now, so if she wants to explore a plunging neckline and display some cleavage, fine. But nobody does vanilla like Taylor Swift, and even when she tries to take chances it seems like she's playing it safe. She's also a tad overdressed for the occasion.

Worst: Chloe Grace Moretz chose a color that should be reserved for road crews working at night, rather than the red carpet. There's no skin tone in the world that can stand up to this retina-burning color.

Photo: Jason Merritt, Getty Images

Worst: Chloe Grace Moretz chose a color that should be reserved for...

Worst: It's painful to see the beautiful and exotic Olivia Munn emerge from dressing herself in the dark. Kids, pay attention -- never mix vertical and horizontal patterns in the same outfit. It gives people vertigo.

Photo: Jason Merritt, Getty Images

Worst: It's painful to see the beautiful and exotic Olivia Munn...

Worst: It's painful to see the beautiful and exotic Olivia... Photo-4008496.54915 - SFGate

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Best: Nothing fancy about Melissa Rauch's frock, but it's not easy to wear a color this rich and get away with it.